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FAIR VALUE DISCLOSURES - Schedule of Fair Value of Fixed-Rate Debt (Details) - Senior Notes [Member] - USD ($) | Sep. 30, 2021 | Apr. 30, 2021 | Apr. 29, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
7.00% senior notes due 2022 [Member] |  |  |  |
Fair value of fixed-rate debt |  |  |  |
Stated interest rate | 7.00% |  | 7.00% |
7.00% senior notes due 2022 [Member] | Level 2 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate Principal | $ 0 |  |  | $ 300,000,000
Fair value of fixed-rate debt |  |  |  |
Estimated Fair Value | $ 0 |  |  | 319,758,000
6.00% senior notes due 2025 [Member] |  |  |  |
Fair value of fixed-rate debt |  |  |  |
Stated interest rate | 6.00% |  |  |
6.00% senior notes due 2025 [Member] | Level 2 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate Principal | $ 400,000,000 |  |  | 400,000,000
Fair value of fixed-rate debt |  |  |  |
Estimated Fair Value | $ 451,000,000 |  |  | 451,913,000
5.125% senior notes due 2027 [Member] |  |  |  |
Fair value of fixed-rate debt |  |  |  |
Stated interest rate | 5.125% |  |  |
5.125% senior notes due 2027 [Member] | Level 2 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate Principal | $ 300,000,000 |  |  | 300,000,000
Fair value of fixed-rate debt |  |  |  |
Estimated Fair Value | $ 333,000,000 |  |  | 333,328,000
3.875% senior notes due 2029 [Member] |  |  |  |
Fair value of fixed-rate debt |  |  |  |
Stated interest rate | 3.875% | 3.875% |  |
3.875% senior notes due 2029 [Member] | Level 2 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate Principal | $ 450,000,000 |  |  | 0
Fair value of fixed-rate debt |  |  |  |
Estimated Fair Value | $ 471,375,000 |  |  | $ 0

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